Compositions and kits for treating pruritus and methods of using the same

ABSTRACT

A treatment for pruritus is described that is based upon amylase. The amylases (α-, β-, γ-amylase) are noted for the cleavage of the α-glycosidic bonds of polysaccharides, yielding lower molecular weight carbohydrate/sugar fragments. It has now been found that α-amylase is effective in the reduction of pruritus (itching) of affected tissue.

FIELD OF THE INVENTION

This invention relates generally to the treatment, amelioration, andprevention of pruritus and its potential concomitant irritation andinflammation in humans and animals using α-amylase and formulationsthereof.

BACKGROUND OF THE INVENTION

Pruritus is a condition that involves localized or general itching,which often leads to the urge to scratch and the stimulation of sensorynerve endings. Scratching can be severe, resulting in irritation andinflammation of the skin, as well as bleeding and infection. Althoughpruritus usually occurs in the skin, it can also occur in non-cutaneoussites, such as mucous membranes or the cornea. A variety of causes ofpruritus are recognized, including external and exogenous effects,localized skin disorders, and systemic diseases. Wound healing afterinjury or surgery is often accompanied by localized itching. Prurituscan also be a component of inflammation.

Histamine is one of the most important mediators of itch, although otherchemical substances have also been implicated, such as neuropeptidesthat act by releasing histamine from mast cells, and itching caused bythem responds to antihistamines. Other substances act independently;therefore, antihistamines are not effective in some forms of pruritus.

A wide variety of treatment modalities for pruritus are reported,including nonspecific topical agents such as emollients andcounter-irritants, topical drugs such as corticosteroids, agonists, suchas cannabinoids or calcineurin inhibitors, local anesthetics, andantihistamines, anticonvulsants, antidepressants, and micro-opioidreceptor antagonists, as well as by physical modalities, such asUV-based phototherapy, cooling, transcutaneous electrical nervestimulation, and acupuncture. Some of these treatments are effective inpruritic conditions of a particular etiology, while others may showgeneral but nonspecific benefit.

Other anti-pruritic and wound-healing agents reported for the treatmentof skin disorders have involved the use of topically applied proteolyticenzyme compositions. In U.S. Pat. No. 3,003,917, compositions useful forthe acceleration of wound healing include relaxin, a proteolytic enzymeor enzymes, and an amylolytic enzyme or enzymes. Relaxin is a proteinhormone and is in the insulin family. The proteolytic enzymes which maybe used in this formulation are trypsin, chymotrypsin, pepsin, papain,bromelain, ficin and mixtures of proteolytic enzymes obtained frombacteria. The amylolytic enzymes which may be used are mixtures ofbacterial amylases, pancreatic or α-amylase and β-amylase. Aparticularly effective composition for accelerating wound healingcomprises relaxin, trypsin, and pancreatic amylase, in respective weightratios of 5:1:1.

In International Patent Publication Number WO 1984/002846, a topicalointment for skin surface wounds is described that includeswound-healing amounts papain, bromelain, trypsin, chymotrypsin,pancreatin, lipase, amylase, aloe extract and an organic astringentagent formulated in a carrier mixture of penetrating and non-penetratingemollient oils and a polyhydric alcohol emollient, with a plurality ofprotease. The ointment is reported to reduce inflammation at the site ofskin-surface wounds and acts to enhance the normal anti-inflammatoryactivities of the body.

In International Patent Publication Number WO 2010/004367, the use of amixture of superoxide dismutase and catalase enzymes for treatingpruritus and alleviating its symptoms is reported.

In International Patent Number WO 8402846, a topical ointment for skinsurface wounds comprising wound-healing amounts of papain, bromelain,trypsin, chymotrypsin, pancreatin, lipase, amylase, aloe extract and anorganic astringent agent formulated in a carrier mixture of penetratingand non-penetrating emollient oils and a polyhydric alcohol emollient isreported. The ointment reportedly reduces inflammation at the site ofskin-surface wounds and acts to enhance the normal anti-inflammatoryactivities of the body, particularly by enhancing the normalanti-inflammatory activity of proteolytic enzymes. The compositionsutilized preferably include wound-cleansing amounts of topically-appliedpancreatic digestive enzymes such as lipases and/or amylases, which areconsidered to affect the fats and carbohydrates contained in thestructure of bacteria and viruses, wherein many types of viruses possessan outer cell envelope composed of protein, lipid and carbohydrateconstituents. According to the WO'846 publication, amylase and/orlipase, in conjunction with the proteolytic enzymes, are thought to actsynergistically to degrade the cell-envelope and protein and lipidcomponents of the virus particle so as to inactivate the pathogenicityof viruses contained in or entering the wound. In this manner,wound-healing is purported to be aided by the control of infectiousmicroorganisms.

In International Patent Publication Number WO 1999/046368, a method fortreating wounds comprising the step of administering an effective amountof a carbohydrate-active enzyme is discussed that reportedly hasbroad-specificity for debriding burns and other wounds. According to theWO'368 publication, because of the high concentrations ofglycosaminoglycans (GAGs) in skin, for burn patients, enzymes thatdegrade glycosaminoglycans are considered to be useful adjuncts to burnwound debridement. GAGs are sugar chains consisting of repeatingpolymers of acidic polysaccharides, composed of building blocks of thefollowing sugars in various combinations: galactose, glucose,N-acetylglucosamine, N-acetylgalactosamine, glucuronic acid,galacturonic acid and iduronic acid. It is known that carbohydrates haveimportant roles in the functioning of living organisms. In addition totheir metabolic roles, carbohydrates are structural components of thehuman body, being covalently attached to numerous other entities such asproteins (i.e., as glycoproteins). Human skin is reported to contain 10%by weight of GAGs, which include heparin, heparan sulfate, chondroitinsulfate, hyaluronic acid (hyaluronan), dermatan sulfate, and keratansulfate, with chondroitin sulfate being the most prevalentglycosaminoglycan. Chondroitin sulfate has β-1,3- and β-1,4-linkagesbetween predominant monomeric units. In the WO'368 publication, the term“carbohydrate-active enzyme” is used to specifically encompasscarbohydrate reducing enzymes, where examples of such enzymes includeglycosaminoglycan reducing enzymes such as hyaluronidases,chondroitinases, dermatanases, heparanases, heparinases and keratanases,with preferred carbohydrate-active enzymes of chondroitinases andhyaluronidases.

In U.S. Patent Application 2013/0273026, a method for modulatinginflammatory molecules with amylase, by modulating Immunoglobulin E(IgE) antibody mediated histamine release from an IgE receptor positivecell has been reported. The method is reportedly capable of releasinghistamine in vitro or in vivo, wherein an effective dose of an amylasepeptide or a derivative thereof is provided to the IgE receptor positivecell in vitro or in vivo under conditions that would permit binding ofamylase to free IgE in solution to form an IgE-amylase binding pair,thereby inhibiting the binding of free IgE to the IgE receptor positivecell. IgE is described as a protein involved in the upregulation of achronic inflammatory response (for example, the chronic inflammatoryresponse observed in Type I diabetes). According to one embodimentdisclosed in the '026 publication, disrupting the function of IgE withamylase provides an ameliorating effect on chronic inflammation. Thisprocess has purported efficacy relative to chronic inflammation incystic fibrosis, Type I and Type II diabetes, such as by modulatingserum insulin, treating obesity, stabilizing serum blood amylase fortreating insulin resistance, modulating histamine levels in a mammal,and treating chronic inflammation. The compositions of the '026publication are reported to be administered systemically, such as orallyor by injection, topically, and transdermally.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph of frequency versus modulus for collagen gels beforeand after treatment with different enzymes.

FIG. 2 is a graph of frequency versus complex modulus for collagen gelsbefore and after treatment with different enzymes.

SUMMARY

The pruritus formulations of this invention contain the enzymeα-amylase. All amylases (α-, β-, γ-amylase) are a family of enzymes thatpreferentially hydrolyze the α-glycosidic bonds of polysaccharides,yielding lower molecular weight carbohydrate/sugar fragments. α-Amylaseis the preferred enzyme of this invention. The benefits of α-amylaseinclude the fact it occurs naturally in humans and other mammals, and itis also is found in plants, bacteria and fungi.

Whereas α-amylases catalyze the hydrolysis of internal α-(1-4)-linkagesof glucose polymers as their main reaction, some α-amylases,particularly saccharifying amylases, can catalyze transfer reactions inaddition to hydrolysis (U.S. Pat. No. 8,486,664; International PatentApplication Number WO 2012/013646). These α-amylases are capable oftransferring glycoside residues to low molecular weight alcohols as wellas to water, a property related to the transferase activity of theglycosidases. It is not known whether such a transglycosylation processis operative in the reduction of pruritus or inflammation of wounds asrelated to this invention.

Without wishing to be bound by the theory for amelioration of pruritus,in this investigation a novel method for pruritus amelioration wasunexpectedly found, with potential concomitant irritation andinflammation reduction, through the topical application of the enzymeα-amylase, an enzyme primarily noted for the cleavage ofα-1,4-glycosidic bonds in starch into low molecular weight sugars.Surprisingly, this effect of pruritus amelioration has not beenpreviously reported although α-amylase has been studied in many formats.

The physical behavior of skin tissue is determined primarily by anextensive extracellular matrix (ECM) composed of an interlocking mesh offibrous proteins and glycosaminoglycans (GAGs). The GAGs arecarbohydrate polymers and are usually attached to ECM proteins, formingproteoglycans. In skin, type I collagen is the main protein component ofthe ECM and the main proteoglycan components are decorin and versican.Presumably, these core proteins bind to the surface of type I collagenfibrils, which provide mechanical strength to skin. Proteoglycan bindingis required for appropriate assembly of collagen fibrils in the ECM andinhibits cleavage of collagen fibrils by matrix metalloproteases.Proteoglycans are composed of a glycoprotein core to which one orseveral GAG chains are covalently bonded. Four different classes ofglycosaminoglycans exist in vertebrates, chondroitin sulfate, dermatansulfate, keratin sulfate, and heparan sulfate/heparin. Hyaluronan(hyaluronic acid) is one of the chief components of the extracellularmatrix, and it contributes significantly to cell proliferation andmigration. However, unlike the other glycosaminoglycans, hyaluronan doesnot attach to proteins to form proteoglycans but binds and retains watermolecules and fills the gaps between collagen fibrils.

The GAGs are attached to a serine residue of the core protein by bothglycosidic β-1,4-bonds (primarily by chondroitin sulfate, dermatansulfate) and α-1,4-bonds (primarily by heparan sulfate/heparin), withthe predominant GAG being chondroitin sulfate. For internal linkages,hyaluronan and chondroitin sulfate are predominantly composed of β-1,3-and β-1,4-linkages, dermatan sulfate has predominantly α-1,3- andβ-1,4-linkages, and heparin/heparan sulfate have a mixture of β-1,4- andα-1,4-linkages, wherein the primary repeating unit does not contain 3 ormore α-1,4-linkages (Glycosaminoglycans and Proteoglycans,sigma.com/glycobiology), as required for cleavage by α-amylase.

A previous study discussed a method for treating wounds comprising thestep of administering an effective amount of a carbohydrate-activeenzyme for treatment of wounds, wherein such enzymes were preferentiallychondroitinases, enzymes that catalyze the hydrolysis of the chondroitinchains on proteoglycans containing (1-4)-β-D- and (1-3)-β-D-linkages,and hyaluronidases, enzymes that cleave hyaluronan, which containsβ-1,4- and β-1,3-glycosidic bonds, with limited ability to degradechondroitin and chondroitin sulfates.

This compositions and methods described herein pertain to the use of anon-protease hydrolytic enzyme for treatment of pruritus and itsresulting irritation and inflammation, where it was unexpectedly foundthat α-amylase was able to ameliorate this condition. The amylase familyof α-amylase, β-amylase, and γ-amylase are hydrolytic enzymes that aidin the cleavage of bonds in sugar residues in polysaccharides. Ofparticular interest is α-amylase. It is found in two primary types inthe human body: salivary amylase and pancreatic amylase. In saliva,salivary amylase is responsible for the breakdown of starch and glycogeninto glucose, maltose, and dextrin. Pancreatic amylase further degradesstarches in the digestive system.

In some embodiments, the non-proteolytic component is greater than theproteolytic component of the enzymatic pruritic composition. In someembodiments, a weight ratio of non-proteolytic enzymes to proteolyticenzymes in the enzymatic pruritic composition is at least 4:1, at least5:1, or at least 10:1, at least 20:1 at least 40:1, at least 60:1, atleast 80:1, or at least 100:1. Where the amount of proteolytic enzymesis 0 and the amount of non-proteolytic enzyme is greater than 0, theratio is ∞:1. In some embodiments, the enzymatic pruritic compositioncomprises less than 0.01% by weight proteolytic enzymes, or less than0.001% by weight of proteolytic enzymes, based on the total weight ofthe debridement composition. In some embodiments, the enzymatic pruriticcomposition comprises up to 20% by weight of proteolytic enzyme, or upto 15% by weight of proteolytic enzyme, or up to 10% by weight ofproteolytic enzyme.

Relative to the three forms of amylase, α-amylase (also called1,4-α-D-glucan glucanohydrolase) is an endoamylase that is found in allliving organisms. It functions in a random manner by a multiple-attackmechanism on starch, glycogen and related polysaccharides andoligosaccharides with α-1,4-glycosidic linkages, ultimately yieldingglucose and maltose as well as larger oligosaccharides, none of whichare present in human skin. α-Amylase hydrolyzes 1,4-α-D-glucosidiclinkages in polysaccharides that contain 3 or more 1,4-α-linkedD-glucose units (Sigma Aldrich,http://www.sigmaaldrich.com/life-science/metabolomics/enzyme-explorer/learning-center/carbohydrate-analysis.htm).However, α-amylase cannot hydrolyze α-1,6-bonds in glycogen andamylopectin.

Q-Amylase (also called 1,4-α-D-glucan maltohydrolase) and γ-amylase(also called (amyloglucosidase, glucan 1,4-α-glucosidase, andglucoamylase) are exoamylases that are found exclusively in plants andmicroorganisms. Like α-amylase, β-amylase cannot hydrolyze α-1,6-bonds.The β-amylase enzyme acts on the same substrates as α-amylase, but itremoves successive maltose units from the non-reducing end. γ-Amylasereleases β-D-glucose successively from the non-reducing end of thepolysaccharide chains. Various forms of γ-amylase can hydrolyze1,6-α-D-glucosidic bonds when the next bond in the sequence is a1,4-bond, and some preparations can hydrolyze 1,6- and1,3-α-D-glucosidic bonds in other polysaccharides. In a related fashion,isoamylase, an isoenzyme form of amylase, is an enzyme that catalyzesthe cleavage of α-1,6-glycosidic branching sections in glycogen,amylopectin, and certain dextrins.

Calcium and chloride ions are essential for the activity of α-amylase.One Ca²⁺ is tightly bound by each enzyme molecule, facilitating theproper conformation for hydrolytic activity, and chloride ions have beenregarded as natural activators of the enzyme. Excess calcium stabilizesα-amylase towards heat. It optimum temperature range for catalyticactivity is between 40° C. and 45° C. and a pH of 7-7.5.

Amylases (α-, β-, γ-amylase) are a family of enzymes that preferentiallyhydrolyze the α-glycosidic bonds of polysaccharides, yielding lowermolecular weight carbohydrate/sugar fragments. In some embodiments, thecompositions and methods described herein include α-amylase as some orall of the amylase. α-Amylase randomly cleaves the 1,4-α-D-glycosidiclinkages between the adjacent glucose units in the linear amylose chainof starch. A significant benefit of α-amylase as used herein is that itoccurs naturally in humans and other mammals, and it is also found inplants, bacteria and fungi. Microbial amylase is generally preferred forcommercial use because it is normally cheaper to produce, its activityis more controllable, and it has reliable supplies of raw materials.Plant and animal sources can contain more harmful material thanmicrobial based amylases, including phenolic compounds (from plants),endogenous enzyme inhibitors, and proteases.

Since amylase is not proteolytic, it does not self-digest in water, andit is more stable compared to proteolytic enzymes under similar aqueousconditions. The high stability of amylase facilitates its storage in ahydrophilic formulation, which can be easily removed from the skin bywashing.

Starch molecules are glucose polymers linked together by α-1,4- andα-1,6-glycosidic bonds, consisting of linear amylose and branchedamylopectin components. In order to make use of the carbon and energystored in starch, amylase, as part of the human digestive system,cleaves starch at multiple points, converting starch into smallersugars, which are eventually converted to glucose units. Because of theexistence of two types of linkages, the α-1,4- and the α-1,6-glycosidicbonds, different structures are possible for starch molecules. Anunbranched, single chain polymer with only the α-1,4-glucosidic bonds iscalled amylose. On the other hand, the presence of α-1,6-glucosidiclinkages results in the branched glucose polymer of amylopectin. Thedegree of branching in amylopectin is approximately one per twenty-fiveglucose units in the unbranched segments. Another closely relatedcompound functioning as the glucose storage in human and animal cells iscalled glycogen, which has one branching per 12 glucose units. Glycogenhas a structure similar to that of amylopectin, except that the branchesin glycogen tend to be shorter and more numerous. Neither amylose, noramylopectin, nor glycogen is believed to be present in human or animalskin as a component of stabilizing or interacting with collagen of theextracellular matrix.

The specificity of the bond attacked by α-amylase depends on the sourceof the enzyme. Currently, two major classes of α-amylases arecommercially produced through microbial fermentation. Based on wherecleavage occurs in the glucose polymer chain, the initial step in randomdepolymerization of starch is the splitting of large chains into varioussmaller sized segments. The breakdown of large segments drasticallyreduces the viscosity of the gelatinized starch solution, resulting inliquefaction because of the reduced viscosity of the solution. The finalstage of the depolymerization is saccharification, which resultspredominantly in the formation of monosaccharides, disaccharides, andtrisaccharides.

Because bacterial α-amylase randomly attacks only the α-1,4-bonds, itbelongs to the liquefying category. On the other hand, the fungalα-amylase belongs to the saccharifying category and attacks the secondlinkage from the nonreducing terminals (i.e., C4 end) of the straightsegment, resulting in the splitting off of two glucose units at a time,giving the disaccharide maltose. The bond breakage is thus moreextensive in saccharifying enzymes than in liquefying enzymes. Thestarch chains are literally chopped into small bits and pieces. Finally.γ-amylase selectively attacks the last bond on the nonreducing terminalsand can act on both the α-1,4- and the α-1,6-glucosidic linkages at arelative rate of 1:20, resulting in the splitting off of simple glucoseunits into the solution, α-Amylase and γ-amylase may be used together toconvert starch to simple sugars.

Amylase has also been used in the cleaning of hard surfaces and fabrics,as described in International Patent Publication Number WO 2007/144856,which include all-purpose or “heavy-duty” washing agents, especiallylaundry detergents; liquid, gel or paste-form all-purpose washingagents, especially the so-called heavy-duty liquid types; liquidfine-fabric detergents; hand dishwashing agents or light dutydishwashing agents, especially those of the high-foaming type; machinedishwashing agents, including the various tablet, granular, liquid andrinse-aid types for household and institutional use; liquid cleaning anddisinfecting agents, including antibacterial hand-wash types, laundrybars, mouthwashes, denture cleaners, car or carpet shampoos, bathroomcleaners; hair shampoos and hair rinses; shower gels and foam baths andmetal cleaners; as well as cleaning auxiliaries such as bleach additivesand “stain-stick” or pre-treat types.

Amylases are one of the main enzymes used in industry. Amylases havepotential application in a wide number of industrial processes such asfood, fermentation and pharmaceutical industries. Although α-amylasescan be obtained from plants, animals and microorganisms, enzymes fromfungal and bacterial sources have dominated applications in industry,including microorganisms of Bacillus spp. and Aspergillus spp., withmost commercial amylases being produced from bacterial sources such asBacillus licheniformis, Bacillus amyloliquefaciens, Bacillus subtilis,or Bacillus stearothermophilus.

The enzymatic pruritic compositions described herein can be formulatedas a liquid, gel, powder, paste, ointment, lotion, slurry, balm,emulsion, or microemulsion, and can be delivered to pruritic tissue withor without irritation and inflammation as a liquid, gel, hydrogel, foam,spray, dressing, mesh, bandage, or film, wherein the latter may containfilm-forming polymers, or a non-degradable substrate, such as adressing, bandage, tape, or foamed material. The enzymatic pruriticcompositions can include one or more pharmaceutically or cosmeticallyacceptable carrier that is compatible with the enzymatic debridementcomposition. Examples of pharmaceutically or cosmetically acceptablecarriers, include, but are not limited to, water, normal saline(isotonic saline), Dulbecco's phosphate-buffered saline (DPBS),phosphate buffered saline (PBS), saline solutions containing addedcalcium chloride, Ringer's solution, Good buffer solutions, glycerin,propylene glycol, ethanol, isopropanol, butane-1,3-diol, liquidpoly(alkylene glycol)s (e.g., poly(ethylene glycol), methylether-terminated poly(ethylene glycol), poly(ethyleneglycol-block-propylene glycol-block-ethylene glycol)), polyoxyethyleneethers, and water-soluble liquid silicone polyethers, or water-insolublemedia, such as, isopropyl myristate, isopropyl palmitate, mineral oil,dimethicone, fatty alcohols, and petrolatum. In some embodiments,excipients can be present in an amount ranging from 0 to 99.9 wt % basedon the weight of the enzymatic pruritic composition.

In some embodiments, the enzymatic pruritic composition can also includewetting agents, buffers, gelling agents or emulsifiers. Other excipientscould include various water-based buffers ranging in pH from 5.0-7.5,surfactants, silicones, polyether copolymers, vegetable and plant fatsand oils, essential oils, hydrophilic and hydrophobic alcohols,vitamins, monoglycerides, laurate esters, myristate esters, palmitateesters, and stearate esters. In some embodiments, the enzymatic pruriticcomposition can be in a form including, but not limited to, liquid, gel,paste, cream, emulsion, combinations thereof, and the like.

In some embodiments, the enzymatic pruritic composition is lyophilizedto a dry powder. The lyophilized enzymatic pruritic composition may beused in powder form, or the powder may be further processed intosolutions, creams, lotions, gels, pastes, balms, sprays, foams,aerosols, films, or other formulations.

The addition of surfactant emulsifiers to form emulsions facilitatescompatibilization with organic solvents. Examples of organic solventsuseful include, but are not limited to, non-stinging solvents, such asvolatile silicone solvents and volatile alkanes to form water-in-oil oroil-in-water emulsions, reverse emulsions, miniemulsions(nanoemulsions), microemulsions and reverse microemulsions. Non-stingingvolatile silicone solvents include, but are not limited to, lowmolecular weight polydimethylsiloxane, such as hexamethyldisiloxane oroctamethyltrisiloxane; low molecular weight cyclic siloxanes, such ashexamethylcyclotrisiloxane or octamethylcyclotetrasiloxane; a linear,branched or cyclic alkane, such as propane, butane, and isobutane(aerosols under pressure), pentane, hexane, heptane, octane, isooctane,and isomers thereof, petroleum distillates, and cyclohexane;chlorofluorocarbons, such as, trichloromonofluormethane,dichlorodifluoromethane, and dichlorotetrafluoroethane; fluorocarbons,such as, tetrafluoroethane, heptafluoropropane, 1,1-difluoroethane,pentafluoropropane, perfluoroheptane, perfluoromethylcyclohexane;hydrofluoroalkanes, such as aerosols of 1,1,1,2,-tetrafluoroethane and1,1,1,2,3,3,3-heptafluoropropane, combinations thereof and the like; andvolatile gases under pressure, such as liquid carbon dioxide; or amixture thereof. As will be understood, when stored under high pressure,carbon dioxide can be present in the form of a liquid at roomtemperature. In some embodiments, the volatile solvent can behexamethyldisiloxane, isooctane, and mixtures thereof. The volatilesolvent can be hexamethyldisiloxane. In some embodiments, solvents canbe present in an amount ranging from 0 wt % to 99.9 wt % based on theweight of the enzymatic pruritic composition.

Water-soluble viscosity builders useful herein for addition to aqueoussolutions of α-amylase include, but are not limited to, methylcellulose,hydroxyethylcellulose, hydroxypropylcellulose,hydroxypropylmethylcellulose, carboxymethylcellulose, guar gum,hydroxypropylguar, hydroxypropylmethylguar, carboxymethylguar,carboxymethylchitosan, locust bean gum, carrageenan, xanthan gum, gellangum. Aloe vera gel, scleroglucan, schizophyilan, gum arabic, tamarindgum, poly(vinyl alcohol), poly(ethylene oxide), poly(ethylene glycol),poly(methyl vinyl ether), Carbomer and its salts, poly(acrylic acid) andits salts, poly(methacrylic acid) and its salts, sodiumpoly(2-acrylamido-2-methylpropanesulfonate), polyacrylamide,poly(N,N-dimethylacrylamide), poly(N-vinylacetamide),poly(N-vinylformamide), poly(2-hydroxyethyl methacrylate), poly(glycerylmethacrylate), poly(N-vinylpyrrolidone), poly(N-isopropylacrylamide) andpoly(N-vinylcaprolactam), the latter two hydrated below their LowerCritical Solution Temperatures, and the like, and combinations thereof.

In some embodiments, soluble polymers that are neutral in charge and arenot enzymatically degradable by amylase can be used as viscositybuilders. Examples of such viscosity builders include, but are notlimited to, poly(ethylene oxide), poly(ethylene glycol), poly(vinylalcohol), and poly(N-vinylpyrrolidone). Other viscosity builders usefulin the enzymatic pruritic compositions described herein include, but arenot limited to, neutral polysaccharides that have β-linkages betweenmonosaccharide units such as in methylcellulose, hydroxyethylcellulose,hydroxypropylcellulose, hydroxypropylmethylcellulose, as well as,polysaccharides that include glycosidic linkages that are not α-1-4linkages, such as in guar and gellan, and the like. Still otherviscosity builders useful in the enzymatic pruritic compositionsdescribed herein include, but are not limited to, those that are anionicin charge, such as Carbomer and its salts, poly(acrylic acid) and itsalts, and poly(methacrylic acid) and its salts. Such viscosity buildersmay be employed in amounts ranging from about 0.01 to about 50.0 weightpercent for preparation of various forms, including viscous gels orpastes. Viscosity builders can be present in amounts ranging from 0.1 to45 wt %, or from 0.5 to 25 wt %, or from 1 to 10 wt %.

Essential oils can also be added to the formulation as fragrance oraromatic agents, and/or as antimicrobial agents. Examples of essentialoils useful in the enzymatic compositions described herein include, butare not limited to, thymol, menthol, sandalwood, camphor, cardamom,cinnamon, jasmine, lavender, geranium, juniper, menthol, pine, lemon,rose, eucalyptus, clove, orange, oregano, mint, linalool, spearmint,peppermint, lemongrass, bergamot, citronella, cypress, nutmeg, spruce,tea tree, wintergreen (methyl salicylate), vanilla, combinationsthereof, and the like. In some embodiments, the essential oils can beselected from thymol, sandalwood oil, wintergreen oil, eucalyptol, pineoil, and combinations thereof. In some embodiments, essential oils canbe present in an amount ranging from 0 to 5 wt % based on the weight ofthe enzymatic pruritic composition.

In some embodiments, chlorophyllin can be used to control odor and toprovide anti-inflammatory properties. In some embodiments, chlorophylincan be present in an amount ranging from 0 to 5 wt % based on the weightof the enzymatic pruritic composition.

In certain embodiments, the amount of non-proteolytic enzymaticcomponent in the enzymatic pruritic composition can be 100 wt %, or atleast 99.5 wt %, or at least 99 wt %, or at least 95 wt %, or at least90 wt %, or at least 85 wt %, or at least 80 wt %. In some embodiments,the amount of non-proteolytic enzymatic component in the enzymaticpruritic composition can be up to 100 wt %, or up to 99.5 wt %, or up to99 wt %, or up to 95 wt %, or up to 90 wt %, or up to 85 wt %, or up to80 wt %. In some embodiments, the amount of non-proteolytic enzymaticcomponent in the enzymatic pruritic composition can be at least 0.001 wt%, or at least 0.01 wt %, or at least 0.05 wt %, or at least 0.075 wt %,or at least 0.1 wt %, or at least 0.15 wt %.

In some embodiments, the amount of amylase in the enzymatic pruriticcomposition can be 100 wt %, at least 99.5 wt %, at least 99 wt %, atleast 95 wt %, at least 90 wt %, at least 85 wt %, or at least 80 wt %.In some embodiments, the amount of amylase in the non-proteolyticenzymatic component can be 100 wt %, at least 99.5 wt %, at least 99 wt%, at least 95 wt %, at least 90 wt %, at least 85 wt %, or at least 80wt %, with the remainder of the non-proteolytic enzymatic component (20wt % or less, 15 wt % or less, 10 wt % or less, 5 wt % or less, 1 wt %or less, 0.5 wt % or less) can be other non-proteolytic enzymes. Theamount of α-amylase can be at least 10 wt %, at least 20 wt %, at least30 wt %, at least 40 wt %, at least 50 wt %, at least 60 wt %, at least70 t-%, at least 80 wt %, at least 90 wt %, or 100 wt % of the amylasecontent. Non-amylase, non-proteolytic enzymes useful in the compositionsdescribed herein include, but are not limited to, hydrolytic, lytic, andoxidative/reductive enzymes selected from the group consisting oflipases, hyaluronidases, chondroitinases, heparanases, heparinases,peroxidases, xylanases, nucleases, phospholipases, esterases,phosphatases, isoamylases, maltases, glycosylases, galactosidases,cutinases, lactases, inulases, pectinases, mannanases, glucosidases,invertases, pectate lyases, reductases, oxidases, phenoloxidases,lipoxygenases, ligninases, pullulanases, tannases, pentosanases,glucanases, arabinosidases, sulfatases, cellulases, hemicellulases,laccases, mixtures thereof, and the like.

The enzymatic pruritic composition can include an aqueous media. In someembodiments, the aqueous media can have a pH in the range 4.5-8.0, or5.5 to 7.5. In some embodiments, the enzymatic pruritic composition canhave an osmolality of 10-340 mOsm/kg. Where the pruritic composition isan aqueous-based solution or gel, a water-soluble polymer can be addedto increase solution viscosity and to prolong residence time of theenzymatic pruritic composition on the on surface of pruritic skin.

In some embodiments, the enzymatic pruritic composition comprises apenetration enhancer in order to enhance transdermal delivery of thesolutions, gels, creams, lotions, pastes, balms, aerosols, and spraysdescribed herein. Penetration enhancers useful in the enzymatic pruriticcompositions described herein include, but are not limited, fatty acidssuch as branched and linear C₆-C₁₈ saturated acids, unsaturated acids,such as C₁₄ to C₂₂, oleic acid, cis-9-octadecenoic acid, linoleic acid,linolenic acid, fatty alcohols, such as saturated C₈-C₁₈ terpenes, suchas d-limonene, α-pinene, 3-carene, menthone, fenchone, pulegone,piperitone, eucalyptol, chenopodium oil, carvone, menthol, α-terpineol,terpinen-4-ol, carveol, limonene oxide, pinene oxide, cyclopentaneoxide, triacetin, cyclohexane oxide, ascaridole,7-oxabicylco[2,2,1]heptane, 1,8-cineole, glycerol monoethers, glycerolmonolaurate, glycerol monooleate, isostearyl isostearate, isopropylmyristate, isopropyl palmitate, isopropyl lanolate, pyrrolidones, suchas N-methyl-2-pyrrolidone, 1-ethyl-2-pyrrolidone,5-methyl-2-pyrrolidone, 1,5-dimethyl-2-pyrrolidone,2-pyrrolidone-5-carboxylic acid, N-hexyl-2-pyrrolidone,N-lauryl-2-pyrrolidone, 1-dodecylazacycloheptan-2-one,4-decyloxazolidin-2-one, N-dodecylcaprolactam, and1-methyl-3-dodecyl-2-pyrrolidone N-n-butyl-N-n-dodecylacetamide,N,N-di-n-dodecylacetamide, N-cycloheptyl-N-n-dodecylacetamide andN,N-di-n-propyldodecanamide, urea, 1-dodecylurea, 1,3-didodecylurea,1,3-diphenyl urea, dimethyl sulfoxide, decylmethyl sulfoxide,tetradecylmethyl sulfoxide, cyclodextrins, and combinations thereof.Also effective penetration enhancers include 1-alkyl-2-piperidinones,1-alkyl-2-azacycloheptanones, such as 1-dodecyazacycloheptan-2-one,1,2,3-alkanetriols, such as 1,2,3-nonanetriol, 1,2-alkanediols, n-,2-(1-alkyl)-2-methyl-1,3-dioxolanes, oxazolidinones, such as4-decyloxazolidin-2-one, N,N-dimethylalkanamides, 1,2-dihydroxypropylalkanoates, such as 1,2-dihydroxypropyl decanoate, 1,2-dihydroxypropyloctanoate, sodium deoxycholate, trans-3-alken-1-ols, cis-3-alken-1-ols,trans-hydroxyproline-N-alkanamide-C-ethylamide, and combinationsthereof. In some embodiments, the penetration enhancers can includehydrophobic esters isopropyl myristate, isopropyl palmitate, orcombinations thereof.

Because of the possibly of infection in damaged and irritated tissue,the enzymatic pruritic compositions can include a biological agent in anamount sufficient to hinder or eradicate microorganisms. Such biologicalagents include, but are not limited to, antibiotics, antiseptics,anti-infective agents, antimicrobial agents, antibacterial agents,antifungal agents, antiviral agents, antiprotozoal agents, sporicidalagents, and antiparasitic agents. In some embodiments, the biologicalagent is biodegradable and non-cytotoxic to human and animal cells.Useful biocidal agents include, but are not limited to, biguanides, suchas poly(hexamethylene biguanide hydrochloride) (PHMB), a low molecularweight synthetic cationic biguanide polymer, chlorhexidine and itssalts, such as chlorhexidine digluconate (CHG), and alexidine and itssalts, where the latter two are bis(biguanides).

In some embodiments, the biguanide is PHMB because of its high biocidalactivity against microorganisms, combined with its biodegradation andlow cytotoxicity. PHMB is primarily active against Gram negative andGram positive bacteria, fungi, and viruses. In contrast to antibiotics,which are considered regulated pharmaceutical drugs, to which bacterialresistance can occur, such resistance does not occur with PHMB. Ingeneral, an antimicrobial agent is defined herein as a substance thatkills microorganisms or inhibits their growth or replication, while ananti-infective agent is defined as a substance that counteractsinfection by killing infectious agents, such as microorganisms, orpreventing them from spreading. Often, the two terms are usedinterchangeably. As used herein, PHMB is considered an antimicrobialagent.

In some embodiments, the enzymatic pruritic composition is an aqueousenzymatic pruritic composition. In some embodiments, aqueous enzymaticpruritic compositions described herein can include biocidal PHMB at aconcentration ranging from 0.01 wt % (100 ppm) to 1 weight % (10,000ppm), or ranging from 0.05 wt % (500 ppm) to 0.5 wt % (5,000 ppm), orranging from 0.1 wt % (1,000 ppm) to 0.15 wt % (1,500 ppm) based on thetotal weight of the enzymatic pruritic composition. Chlorhexidine andits salts can be added to the antimicrobial compositions inconcentrations ranging from 10 ppm (0.001 wt %) to 20,000 ppm (2.0 wt%), while alexidine and its salts can be used in concentrations rangingfrom 10 ppm (0.001 wt %) to 350 ppm (0.035 wt %), with both percentagesbeing based on the total weight of the enzymatic pruritic compositions.

The dosage at which the therapeutic amylase compositions areadministered to pruritic skin is dependent upon the source of theamylase, the activity (i.e., the number of units involved), the size ofirritated tissue, the age of the patient, and the incidence ofinfection. The amount of therapeutic amylase that may be administered upto twice per day can range from application of a powder (at 100 wt %) toa dilute solution (of about 0.001 wt %). In some embodiments, theactivity of the amylase can range from 250 Units to 250,000 Units pergram of enzyme in 1 gram of enzymatic pruritic composition. In clinicalinstances of pruritus, application can be performed by trained medicalpersonnel. The amylase method of ameliorating pruritus can be performedin combination with other known methods of desensitizing the skin toitching or to reducing inflammation.

The enzymatic pruritic composition may be applied topically to theirritated tissue as needed to reduce pruritus and, if present,irritation and inflammation. For example, in some embodiments, theenzymatic pruritic composition may be in contact with the irritated orinflamed tissue for about 1 to 48 hours, 1 to 24 hours, 1 to 12 hours, 1to 8 hours, 1 to 4 hours, or 1 to 2 hours, or from 1 to 60 minutes to 1to 5 minutes before removal. In some embodiments, the method ofrelieving pruritus can include applying the enzymatic pruriticcomposition periodically (e.g., every hour, every 2 hours, every 3hours, every 4 hours, every 6 hours, every 8 hours, etc.) while thepruritus persists. Removal of the enzymatic pruritic composition ispreferably by wiping or by rinsing with saline or water. These steps maybe repeated as needed. A wide variety of pruritic skin areas can betreated with the enzymatic pruritic composition described herein,including surrounding areas of full and partial thickness burn wounds,diabetic ulcers, ulcerative lesions, principally pressure (decubitus)ulcers, venous ulcers, trophic ulcers, surgical wounds such asamputation, incisions, traumatic and pyogenic wounds, donor and receptorskin graft wounds, dermatological abrasions, eczema, rashes, dry skin,pimples, contact dermatitis, psoriasis, rosacea, seborrheic dermatitis,insect bites, acne, cysts, blisters, radiation wounds, chemical andbiological irritants, sunburn, and frostbite.

Similarly, a kit described herein can include instructions to apply theenzymatic pruritic composition periodically (e.g., every hour, every 2hours, every 3 hours, every 4 hours, every 6 hours, every 8 hours, etc.)while the pruritus persists. In some embodiments, the instructions caninclude removing or rinsing the enzymatic pruritic composition (e.g., bywiping or rinsing) a set time period following application of theenzymatic pruritic composition.

As used herein, proteolytic enzymes break (cleave, digest) the longchainlike polymer molecules of proteins into shorter fragments ofpeptides and, eventually, into their basic components of amino acids.

As used herein, a covalent bond that is formed between a carbohydratemolecule and another molecule, particularly between two monosaccharidesmoieties, is a glycosidic bond or glycodisic linkage.

As used herein, α-1,4-glycosidic linkages are bonds that are normallyformed between the carbon-1 on one sugar and the carbon-4 on anothersugar moiety in a polysaccharide. A α-glycosidic bond is formed when the—OH group on carbon-1 is below the plane of the glucose ring. On theother hand, a β-glycosidic bond is formed when it is above the plane.For example, cellulose is formed of glucose molecules linked by 1-4β-glycosidic bonds, whereas starch is composed of 1-4 α-glycosidicbonds.

As used herein, α-amylase includes naturally occurring α-amylases aswell as recombinant α-amylases, wherein recombinant α-amylase means anα-amylase in which the DNA sequence encoding the naturally occurringα-amylase is modified to produce a mutant DNA sequence that encodes thesubstitution, insertion or deletion of one or more amino acids in theα-amylase sequence compared to the naturally occurring α-amylase.

As used herein, an “isoenzyme” is a chemically distinct form of anenzyme that performs the same biochemical function.

As used herein, the amount of enzyme utilized is expressed in weightpercent and its activity is given in Units of activity per gram, where a“Unit” is defined as the amount of enzyme that catalyzes the conversionof 1 micromole of substrate per minute.

As used herein, the term “amylolytic” is characterized by or capable ofthe enzymatic digestion of starch into dextrins and sugars.

As used herein, the term “lipolytic” pertains to the hydrolysis oflipids, particularly the hydrolysis of triglycerides into glycerol andthree fatty acids.

As used herein, the term “keratolytic agent” pertains to a materialcausing the softening and shedding of the outer layer of the skin.

As used herein, “surfactant” has its standard meaning and includesemulsifying agents, emulsifiers, detergents, and surface-active agents.

As used herein, “microemulsion” is has its standard meaning and includesthermodynamically stable mixtures of oil, water (and/or hydrophiliccompound) and surfactant. Microemulsions include three basic types:direct (oil dispersed in water, o/w), reverse (water dispersed in oil,w/o) and bicontinuous. Microemulsions are optically clear because thedispersed micelles have a diameter that is less than the wavelength ofvisible light (e.g., less than 380 nanometers, less than 200 nanometers,or less than 100 nanometers) in diameter. In the absence of opacifiers,microemulsions are optically clear, isotropic liquids.

As used herein, “reverse microemulsion” has its standard meaning andincludes a microemulsion comprising a hydrophilic phase suspended in acontinuous oil phase. A reverse microemulsion can include droplets of ahydrophilic phase (e.g., water, alcohol, or a mixture of both)stabilized in an oil phase by a reverse emulsion surfactant. In suchinstances, a hydrophilic active agent can be solubilized in thedroplets. However, in other instances, the reverse microemulsion can befree of water and/or alcohol, and the hydrophilic active agent can bedirectly solubilized in the oil phase by the reverse emulsionsurfactant.

As used herein, “hydrophilic” has its standard meaning and includescompounds that have an affinity to water and can be ionic or neutral orhave polar groups in their structure that attract water. For example,hydrophilic compounds can be miscible, swellable or soluble in water.

As used herein, “aqueous” compositions refer to a spectrum ofwater-based solutions including, but not limited to, homogeneoussolutions in water with solubilized components, emulsified solutions inwater stabilized by surfactants or hydrophilic polymers, and viscous orgelled homogeneous or emulsified solutions in water.

As used herein, an enzyme is “soluble” or “solubilized” if the amount ofenzyme present in the solvent system is dissolved in the solvent systemwithout the enzyme forming a precipitate or visible, swollen gelparticles in solution.

As used herein, “non-stinging” means that the formulation does not causea sharp, irritatingly, burning or smarting pain as a result of contactwith a biological surface.

As used herein, “volatile” has its standard meaning, that is, it canevaporate rapidly at normal temperatures and pressures. For example, asolvent is volatile if one drop (0.05 mL) of the solvent will evaporatecompletely between 20-25° C. within 5 minutes, or within 4 minutes, orwithin 3 minutes, or within 2 minutes, or within 1 minute, or within 30seconds, or within 15 seconds.

As used herein, an “antimicrobial agent” is defined as a substance thatkills microorganisms or inhibits their growth or replication, while an“anti-infective agent” is defined as a substance that counteractsinfection by killing infectious agents, such as microorganisms, orpreventing them from spreading. Often, the two terms are usedinterchangeably. Antibiotics are considered those substances that wereoriginally produced by a microorganism or synthesized with activeproperties that can kill or prevent the growth of another microorganism.The term “antibiotic” is commonly used to refer to almost any prescribeddrug that attempts to eliminate infection. Antimicrobial agents do notcause biocidal resistance such as can occur with antibiotics, whereinantibiotic resistance to a drug can occur. Antimicrobial agents have abroad spectrum of activity against bacteria, fungi, viruses, protozoaand prions. Examples of antimicrobial agents include biguanides, such aspoly(hexamethylene biguanide hydrochloride) (PHMB), chlorhexidine andits salts, alexidine and its salts, povidone/iodine, cadexomer iodine,silver sulfadiazine, nanocrystalline silver, ionic silver, honey, dilutebleaching agents such as sodium hypochlorite and hypochlorous acid,hydrogen peroxide, organic peroxides such as benzoyl peroxide, alcoholssuch as ethanol and isopropanol, anilides such as triclocarban,bisphenols such as triclosan, chlorine compounds, and quaternaryammonium compounds such as benzalkonium chloride, benzethonium chloride,cetyltrimethylammonium chloride, cetylpyridinium chloride, andalkyltrimethylammonium bromides, as well as miconazole, clotrimazole,ketoconazole, fluconazole, crystal violet, amphotericin B, tee tree oil,combinations thereof, and the like. Biguanides, such as PHMB, are usefulin the enzymatic pruritic compositions described herein.

A polymeric biguanide useful in the enzymatic pruritic compositionsdescribed herein is poly(hexamethylene biguanide), commerciallyavailable from Arch Chemicals, Inc., Smyrna, Ga. under the trademarkCosmocil™ CQ. Poly(hexamethylene biguanide) polymers are also referredto as poly(hexamethylene biguanide) (PHMB), poly(hexamethylenebisbiguanide) (PHMB), poly(hexamethylene guanide) (PHMB),poly(aminopropyl biguanide) (PAPB), poly[aminopropylbis(biguanide)](PAPB), polyhexanide andpoly(iminoimidocarbonyl)iminohexamethylene hydrochloride; however, PHMBis the preferred abbreviation. PHMB is a broad spectrum antimicrobialand has been used in contact lens multipurpose solutions, wound rinsingsolutions, wound dressings, perioperative cleansing products,mouthwashes, surface disinfectants, food disinfectants, veterinaryapplications, cosmetic preservatives, paper preservatives, secondary oilrecovery disinfectants, industrial water treatments, and in swimmingpool cleaners. It is normally obtained commercially in the hydrochlorideform in water. Other antimicrobial polymers can also be added, such aspolyquaternium 1, polyquaternium 6, polyquaternium 10, cationic guar,and water-soluble derivatives of chitosan.

As used herein, “antibiotic resistance” is the ability of bacteria andother microorganisms to resist the effects of an antibiotic to whichthey were once susceptible.

The enzymatic pruritic composition described herein can include abiocidal monoalkyl glycol, glycerol alkyl ether, and monoacyl glycerolat a combined concentration of from 0.05 wt % (500 ppm) to 4 wt % (4,000ppm), or from 0.1 wt % (1,000 ppm) to 1 wt % (10,000 ppm), or from 0.4wt % (4,000 ppm) to 0.6 wt % (6,000 ppm) based on the weight of theenzymatic pruritic composition. The monoalkyl glycol, glycerol alkylether, and monoacyl glycerol can be hydrophobic.

As used herein, “hydrophobic” refers to repelling water, being insolubleor relatively insoluble in water, and lacking an affinity for water.Hydrophobic compounds with hydrophilic substituents, such as vicinaldiols, may form emulsions in water, with or without added surfactant.

As used herein. “amphoteric” refers to a mixture of cationic and anioniccharges on a molecule or polymer in which overall charge is locally pHdependent, whereas “ampholytic” has an equal number of cationic andanionic charges over a broad pH range.

As used herein, “pruritus” refers to an intense sensation of itching.

As used herein, “inflammation” refers to a localized reaction thatproduces redness, warmth, swelling, and pain as a result of infection,irritation, or injury. Inflammation can be external or internal.

As used herein, “irritation” of the skin refers to a reaction to anirritant or an inducement of discomfort resulting in itchiness andinflammation.

As used herein, an “enzyme unit” (U) is generally defined as the amountof the enzyme that produces a certain amount of enzymatic activity, thatis, the amount that catalyzes the conversion of 1 micromole of substrateper minute.

As used herein, an “excipient” is a usually inert substance that forms avehicle, such as a liquid, fluid, or gel, that solubilizes or dispersesa biological formulation, such as an enzyme.

Examples of monoalkyl glycols useful in the enzymatic pruriticcompositions described herein include, but are not limited to,1,2-propanediol (propylene glycol), 1,2-butanediol, 1,2-pentanediol,1,2-hexanediol, 1,2-heptanediol, 1,2-octanediol (caprylyl glycol),1,2-nonanediol, 1,2-decanediol, 1,2-undecanediol, 1,2-dodecanediol,1,2-tridecanediol, 1,2-tetradecanediol, 1,2-pentadecanediol,1,2-hexadecanediol, 1,2-heptadecanediol and 1,2-octadecanediol.Non-vicinal glycols can also be added to enhance biocidal activity.Exemplary, non-vicinal glycols include, but are not limited to,2-methyl-2,4-pentanediol, 1,3-butanediol, diethylene glycol, triethyleneglycol, and glycol bis(hydroxyethyl)ether.

Examples of glycerol alkyl ethers useful in the enzymatic pruriticcompositions described herein include, but are not limited to,1-O-heptylglycerol, 1-O-octylglycerol, 1-O-nonylglycerol,1-O-decylglycerol, 1-O-undecylglycerol, 1-O-dodecylglycerol,1-O-tridecylglycerol, 1-O-tetradecylglycerol, 1-O-pentadecylglycerol,1-O-hexadecylglycerol (chimyl alcohol), 1-O-heptadecyiglycerol,1-O-octadecylglycerol (batyl alcohol), 1-O-octadec-9-enyl glycerol(selachyl alcohol), glycerol 1-(2-ethylhexyl)ether (also known asoctoxyglycerin, 2-ethylhexyl glycerin,3-(2-ethylhexyloxy)propane-1,2-diol, and Sensiva® SC 50), glycerol1-heptyl ether, glycerol 1-octyl ether, glycerol 1-decyl ether, andglycerol 1-dodecyl ether, glycerol 1-tridecyl ether, glycerol1-tetradecyl ether, glycerol 1-pentadecyl ether, glycerol 1-hexadecylether and glycerol 1-octadecyl ether.

Examples of monoacyl glycerols useful in the enzymatic pruriticcompositions described herein include, but are not limited to,1-O-decanoylglycerol (monocaprin), 1-O-undecanoylglycerol,1-O-undecenoylglycerol, 1-O-dodecanoylglycerol (monolaurin, also calledglycerol monolaurate and Lauricidin®), 1-O-tridecanoylglycerol,1-O-tetradecanoylglycerol (monomyristin), 1-O-pentadecanoylglycerol,1-O-hexadecanoylglycerol, 1-O-heptadecanoylglycerol, and1-O-octanoylglycerol (monocaprylin). In general, glycerols substitutedin the 1-O-position are more preferred than those substituted in the2-O-position, or disubstituted in the 1-O and 2-O positions.

The enzymatic pruritic compositions can include one or more additionalsurfactants for cleansing of the skin surface. Suitable surfactantsinclude, but are not limited to cationic, anionic, nonionic, amphotericand ampholytic surfactants. In some embodiments, the surfactants arenon-stinging or low irritant nonionic and amphoteric surfactants. Insome embodiments, the surfactant can be present in an amount rangingfrom 0 to 10 wt % based on the weight of the enzymatic pruriticcomposition. The surfactants can have an HLB (hydrophilic-lipophilicbalance) value of 18-30 in order to not distort the catalytic structureof amylase in solution as well as not hindering the biocidal activity ofany added antimicrobial agents, while facilitating a non-cytotoxicsolution. The high values of the HLB represent surfactants that are morehydrophilic than those with lower HLB values.

Suitable nonionic surfactants include, but are not limited to, theethylene oxide/propylene oxide block copolymers of poloxamers, reversepoloxamers, poloxamines, and reverse poloxamines. Poloxamers andpoloxamines are preferred, and poloxamers are most preferred. Poloxamersand poloxamines are available from BASF Corp. under the respective tradenames of Pluronic® and Tetronic®. Suitable Pluronic surfactants comprisebut are not limited to Pluronic F38 having a HLB of 31, Pluronic F68having a HLB of 29, Pluronic 68LF having a HLB of 26, Pluronic F77having a HLB of 25, Pluronic F87 having a HLB of 24, Pluronic F88 havinga HLB of 28, Pluronic F98 having a HLB of 28. Pluronic F108 having a HLBof 27, Pluronic F127 (also known as Poloxamer 407) having a HLB of18-23, and Pluronic L35 having a HLB of 19. An exemplary poloxaminesurfactant of this type is Tetronic 1107 (also known as Poloxamine 1107)having an HLB of 24.

In addition to the above, other neutral surfactants may be added, suchas for example polyethylene glycol esters of fatty acids, e.g., coconut,polysorbate, polyoxyethylene or polyoxypropylene ethers of higheralkanes (C₁₂-C₁₈), polysorbate 20 available under the trademark Tween20, polyoxyethylene (23) lauryl ether available under the trademark Brij35, polyoxyethylene (40) stearate available under the trademark Myrj 52,and polyoxyethylene (25) propylene glycol stearate available under thetrademark Atlas G 2612, all available by Akzo Nobel, Chicago, Ill. Otherneutral surfactants include nonylphenol ethoxylates such as nonylphenolethoxylates, Triton X-100, Brij surfactants of polyoxyethylenevegetable-based fatty ethers, polyoxyethylene ethers, Tween 80, decylglucoside, and lauryl glucoside.

Amphoteric surfactants suitable for use in antimicrobial compositionsaccording to the present invention include materials of the type offeredcommercially under the trademark Miranol (Rhodia). Another useful classof amphoteric surfactants is exemplified by betaines, includingcocoamidopropyl betaine, undecylenamidoalkylbetaine, andlauramidoalkylbetaine and sodium cocoamphoacetate. Amphotericsurfactants are very mild and have excellent dermatological properties,making them particularly suited for use in personal care applications,particularly regarding treatment for pruritus and irritation.

Suitable reverse emulsion surfactants include sodiumbis(2-ethylhexyl)sulfosuccinate (Aerosol AOT, also called AOT, docusatesodium, DSS, Aerosol OT, and sodium1,4-bis(2-ethylhexoxy)-1,4-dioxobutane-2-sulfonate), sodiumbis(tridecyl)sulfosuccinate, bis(dialkyl)sulfosuccinate salts,copolymers of polydimethylsiloxane and polyethylene/polypropylene-oxide,polyoxypropylene (12) dimethicone, cetyl PEG/PPG-10/1 dimethicone, hexyllaurate and polyglyceryl-4-isostearate, PEG-10 dimethicone, sorbitanmonolaurate, sorbitan monooleate, polyoxyethylenesorbitan trioleate,polyoxyethylene octyl phenyl ether, polyoxyethylene 10 cetyl ether,polyoxyethylene 20 cetyl ether, polyethylene glycol tert-octylphenylether, sodium di(2-ethylhexyl)phosphate, sodium di(oleyl)phosphate,sodium di(tridecyl)phosphate, sodium dodecylbenzenesulfonate, sodium3-dodecylaminopropanesulfonate, sodium 3-dodecylaminopropionate, sodiumN-2-hydroxydodecyl-N-methyltaurate, lecithin, sucrose fatty acid esters,2-ethylhexylglycerin, caprylyl glycol, long chain hydrophobic vicinaldiols of monoalkyl glycols, monoalkyl glycerols, or monoacyl glycerols,polyoxyl castor oil derivatives, polyethylene glycol hydrogenated castoroil, tetraethylene glycol dodecyl ether, potassium oleate, sodiumoleate, cetylpyridynium chloride, alkyltrimethylammonium bromides,benzalkonium chloride, didodecyldimethylammonium bromide,trioctylmethylammonium bromide, cetyltrimethylammonium bromide,cetyldimethylethylammonium bromide, and the like, with or without addedalkanols such as isopropanol, 1-butanol, and 1-hexanol, and combinationsthereof. The reverse emulsion surfactants can be dialkylsulfosuccinatesalts, such as sodium bis(2-ethylhexyl)sulfosuccinate.

In some embodiments, the enzymatic pruritic composition can includedialkylsulfosuccinates, such as sodium bis(2-ethylhexy)sulfosuccinate(AOT). Dialkylsulfosuccinates have been demonstrated to haveantibacterial, anti-fungal and anti-viral properties (U.S. Pat. Nos.4,717,737, 4,719,235 and 4,885,310). This effect would be expected toenhance the antimicrobial and anti-infective properties of the reversemicroemulsion compositions described herein.

The enzymatic pruritus compositions may also contain chlorophyllin andits water-soluble derivatives in order to reduce local inflammation,promote healing, and controlling odor, if present (U.S. Pat. No.2,917,433).

If pain reduction is required during treatment of pruritic tissue, whichmay involve irritation and inflammation, the enzymatic pruriticcomposition can further comprise analgesic agents, anesthetic agents,and neuropathic pain agents, such as lidocaine, capsaicin, calaminelotion, benzocaine, tetracaine, prilocaine, bupivacaine,levobupivacaine, procaine, carbocaine, etidocaine, mepivacaine,nortripylene, amitriptyline, pregabalin, diclofenac, fentanyl,gabapentin, opiods, ketoconazole, non-steroidal anti-inflammatoryagents, salicylates, leukotriene antagonists, combinations thereof, andthe like.

The enzymatic pruritic composition may further comprise a chelatingagent at a concentration of from 0 weight % to 1 weight %. For example,the chelating agent can be present in an amount of at least 0.01 wt %,or at least 0.03 wt %, or at least 0.05 wt %, or at least 0.1 wt %, orat least 0.50 wt %, or at least 0.75 wt %, or at least 1.0 wt %. Thechelating agent can be selected from the group that includes, but is notlimited to, ethylenediaminetetraacetic acid (EDTA), nitrilotriaceticacid, nitrilotripropionic acid, diethylenetriaminepentaacetic acid,2-hydroxyethylethylenediaminetriacetic acid,1,6-diaminohexamethylenetetraacetic acid,1,2-diaminocyclohexanetetraacetic acid,O,O′-bis(2-aminoethyl)ethyleneglycoltetraacetic acid,1,3-diaminopropanetetraacetic acid,N,N′-bis(2-hydroxybenzyl)ethylenediamine-N,N′-diacetic acid,ethylenediamine-N,N′-diacetic acid, ethylenediamine-N,N′-dipropionicacid, triethylenetetraaminehexaacetic acid,ethylenediamine-N,N′-bis(methylenephosphonic acid), iminodiacetic acid,monosodium-N-lauryl-β-iminodipropionic acid (sodiumlauriminodipropionate, Deriphat® 160C), N,N-bis(2-hydroxyethyl)glycine,1,3-diamino-2-hydroxypropanetetraacetic acid,1,2-diaminopropanetetraacetic acid,ethylenediaminetetrakis(methylenephosphonic acid),N-(2-hydroxyethyl)iminodiacetic acid, biphosphonates, editronate, andsalts thereof.

In some embodiments, a kit that includes a container containing anenzymatic pruritic composition according to any of the variationsdescribed herein, and instructions for using the enzymatic pruriticcomposition for treatment or pruritus is described. The instructions caninclude contacting the enzymatic pruritic composition with an area ofskin in need of treatment for pruritus. The instructions can includerepeating the contacting step at regular intervals. The regularintervals can be at least once a day, or at least twice a day (every 12hours), or at least three times a day (every 8 hours), or as needed. Theinstructions can include mixing and or diluting the enzymatic pruriticcomposition in a solvent or other carrier liquid. The instructions caninclude removal of the enzymatic pruritic composition by wiping and bysolvent rinsing (e.g., using soapy water).

A method of treatment of pruritus is also described. The method caninclude contacting an enzymatic pruritic composition according to any ofthe variations described herein with an area of skin experiencingpruritus, such as by a powder, liquid, gel, hydrogel, foam, paste,cream, spray, or film. In some embodiments, the enzymatic pruriticcomposition is applied to a sterile dressing, such as gauze, cloth,fiber, alginate, hydrocolloid, composite, or film. In some embodiments,the wound dressing is composed of natural or synthetic components, orcombinations thereof. The method can also include allowing the enzymaticpruritic composition to remain on the skin for a given period of time(e.g., 1 minute, or 5 minutes, or 15 minutes, or 1 hour). The method caninclude repeating the contacting step at regular intervals. In someembodiments, the regular intervals can be at least once a day, or atleast twice a day (every 12 hours), or at least three times a day (every8 hours). In some embodiments, the method also includes removing theenzymatic pruritic composition from the area of skin.

It is an object of the compositions, kits, and methods described hereinto provide amylase for treatment of pruritic tissue in humans andanimals.

It is a further object of the compositions, kits, and methods describedherein to provide amylase for treatment of irritated or inflamed tissueresulting from scratching or rubbing of pruritic tissue.

It is a further object of the compositions, kits, and methods describedherein to treat pruritus and concomitant skin irritation andinflammation comprising the step of administering an effective amount ofα-amylase enzyme.

It is a further object of the compositions, kits, and methods describedherein to provide carbohydrate hydrolytic enzymes for enzymatic pruritustreatment based upon the amylase family, selected from combinations ofα-amylase, with β-amylase, and γ-amylase.

It is a further object of the compositions, kits, and methods describedherein to provide for enzymatic pruritus treatment based on amylase,wherein the amount of amylase in a enzymatic pruritic compositioncapable of reducing or eliminating itch may be 100 wt %, at least 99.5wt %, at least 99 wt %, at least 95 wt %, at least 90 wt %, at least 85wt %, or at least 80 wt % of an amylase, preferably containing at least10 wt % α-amylase, with other non-amylase enzymes of 20 wt % or less.

It is a further object of the compositions, kits, and methods describedherein to provide for enzymatic pruritus treatment wherein families ofhydrolytic cleavage enzymes other than amylases include 20 wt % or lessof proteases, chondroitinases, hyaluronidases, lipases, glycosidases,heparanases, dermatanases, pullulanases, N-acetylglucosaminidase,lactases, phospholipases, transglycosylases, esterases, thioesterhydrolyases, sulfatases, escharases, nucleases, phosphatases,phosphodiesterases, mannanases, mannosidases, isoamylases, lyases,inulinases, keratinases, tannases, pentosanases, glucanases,arabinosidases, pectinases, cellulases, chitinases, xylanases,cutinases, pectate lyases, hemicellulases, combinations thereof, and thelike.

It is a further object of the compositions, kits, and methods describedherein to provide for enzymatic pruritus treatment wherein families ofenzymes other than amylases include 20 wt % or less of oxidases,peroxidases, glucose oxidases, catalases, oxidoreductases,phenoloxidases, laccases, lipoxygenases, isomerases, and ligninases.

It is a further object of the compositions, kits, and methods describedherein to provide for enzymatic pruritus treatment based upon α-amylase,wherein the α-amylase is administered in the form of a powder, gel,paste, liquid, ointment, balm, cream, foam or spray.

It is a further object of the compositions, kits, and methods describedherein to provide for enzymatic pruritus treatment based upon α-amylase,wherein the α-amylase is administered on or in a bandage, mesh, film,foam, coating or dressing of natural or synthetic origin.

It is a further object of the compositions, kits, and methods describedherein to provide for enzymatic pruritus treatment based upon α-amylasethat is administered topically.

It is a further object of the compositions, kits, and methods describedherein to provide for enzymatic pruritus treatment based upon α-amylase,wherein the α-amylase is applied in a hydrophilic or aqueous medium.

It is a further object of the compositions, kits, and methods describedherein to reduce irritation and inflammation resulting from pruritus bytreatment with α-amylase.

It is a further object of the compositions, kits, and methods describedherein to ameliorate pruritus by treatment with α-amylase.

It is a further object of the compositions, kits, and methods describedherein to provide a pleasing fragrance to the enzymatic pruriticcompositions.

It is a further object of the compositions, kits, and methods describedherein to add chlorophyllin to an enzymatic pruritus treatment basedupon α-amylase to reduce local inflammation, promote healing, andcontrol odor.

It is a further object of the compositions, kits, and methods describedherein to provide a dressing for amylase pruritus treatment comprised ofgauze, cloth, mesh, fiber, foam, natural or synthetic fiber, mesh,hydrocolloid, alginate, hydrogel, semipermeable film, permeable film, ora natural or synthetic polymer.

It is a further object of the compositions, kits, and methods describedherein to provide for preserved formulations of α-amylase.

It is a further object of the compositions, kits, and methods describedherein to provide for enzymatic pruritic compositions of α-amylase.

It is a further object of the compositions, kits, and methods describedherein to provide for enzymatic pruritic compositions of α-amylase thatreduce or eliminate Gram positive and Gram negative bacteria.

It is a further object of the compositions, kits, and methods describedherein to provide for enzymatic pruritic compositions of α-amylase thatreduce or eliminate yeast.

It is a further object of the compositions, kits, and methods describedherein to provide for enzymatic pruritic compositions of α-amylase basedupon polymeric biguanide-containing compositions.

It is a further object of the compositions, kits, and methods describedherein to provide for enzymatic pruritic compositions that incorporateantimicrobial essential oils to the α-amylase compositions.

It is a further object of the compositions, kits, and methods describedherein to provide a surfactant capable of cleansing a tissue surface forα-amylase pruritus treatment.

It is a further object of the compositions, kits, and methods describedherein to provide for α-amylase-based pruritus treatment a hydrophilicpolymer capable of increasing viscosity or causing gelation of theformulation to increase residence time on the affected tissue.

It is a further object of the compositions, kits, and methods describedherein to provide delivery of α-amylase from a hydrophobic, volatilesolvent to pruritic tissue.

It is a further object of the compositions, kits, and methods describedherein to provide a surfactant capable of solubilizing α-amylase into ahydrophobic, volatile solvent.

It is a further object of the compositions, kits, and methods describedherein to provide a hydrophobic, volatile solvent that is non-stingingto pruritic tissue.

It is a further object to form a reverse microemulsion through thecombination of a surfactant with water and a nonpolar solvent tosolubilize α-amylase.

It is a further object of the compositions, kits, and methods describedherein to provide an amylase formulation for treatment of pruritus andits concomitant irritated and inflamed tissue that also hasantimicrobial properties.

EXAMPLES

The following ingredients and their abbreviations are used in thisinvention:

Enzymes

α-Amylase #1, porcine pancreas, 30 U/mg, Sigma Aldrich, A3176-500KU, lotSLBF3831V.α-Amylase #2, porcine pancreas, (contains 0.2% protease), 230 U/mg, LeeBioSolutions, lot M60404.α-Amylase #3, porcine pancreas, (contains 0.05% protease), 210 U/mg, LeeBioSolutions, lot P70442.α-Amylase #4, human saliva, 117.5 U/mg, Sigma Aldrich, lot SLBB8953V.α-Amylase #5, Bacillus licheniformis, 500-1500 U/mg, Sigma Aldrich, lotSLBG8595V.α-Amylase #6, Bacillus subtilis spp., powder, 7278 U/mg, DyadicInternational, lot ADY4001.α-Amylase #7. Bacillus subtilis spp., solution, 1269 U/mg, DyadicInternational, lot ASP3001.β-Amylase, barley, 41.6 U/mg, Sigma Aldrich, lot SLBC2932V.γ-Amylase #1, Aspergillus niger, 129.2 U/mg, Sigma Aldrich, lotBCBD1453V.

γ-Amylase #2, Rhizopus spp., MyBiosource Inc., lot 22200303.

Collagenase, Type I, Clostridium histolyticum, 125 U/mg, Sigma Aldrich.C0130-100UG, lot SLBH5757V.Lipase, porcine pancreas, (contains <0.05% protease), 360 U/mg, LeeBioSolutions, 400-10, lot R24160.

Other Ingredients

-   AC, Antimicrobial Composition. Water, 95.5 wt %, PHMB 0.1 wt %, EDTA    0.065 wt %, P407 2 wt %, HPMC, 2 wt %, SC50, 0.3 wt %, SC10, 0.1 wt    %, pH 5.5.-   AOT: Aerosol AOT, sodium bis(2-ethylhexyl)sulfosuccinate, Fisher    Scientific, lot 112760.-   CHG, Chlorhexidine gluconate, Spectrum Chemicals, lot ZQ1023.-   Chlorophylin, Sigma, MKBQ6480V.-   Collagen, type I, rat tail, Corning Inc., 354236, lot 3298599.-   DC 193, PEG-12 Dimethicone, Dow Corning, lot 0002250697.-   Dulbecco's Phosphate Buffered Saline, DPBS, Sigma Aldrich, D8537,    lot RNBC1143.-   EDTA, Ethylenediaminetetraacetic acid di-, tri-sodium salts,    Spectrum Chemicals, lots 1AE0430, YL0044.-   Glycerin: Quality Choice, lot 519675.-   HMDS: Hexamethyldisiloxane, Gelest Lot 2A-17635.-   Hydroxypropylmethylcellulose (HPMC), Amerchol Corp., lot WF15012N01.-   Mineral Oil, CVS, lot 5BF0201.-   PHMB, Poly(hexamethylene biguanide hydrochloride), Cosmocil™ CQ,    Arch Chemical, lot 11RC116995.-   P407, Poloxamer 407, Pluronic F127, Spectrum Chemicals, lot 1AD0265.-   PEG 400, Poly(ethylene glycol), 400 M_(n), Sigma Aldrich, lot    MKBD2642V.-   Petrolatum: Vaseline, lot 02011HU00.-   Polymer JR-30M. Amerchol, lot XL2850GRXA.-   SC10, Sensiva® SC 10, 1,2-Dihydroxyoctane), Schülke & Mayr, lot    1178933.-   SC50, Sensiva® SC 50, Glycerol 1-(2-ethylhexyl)ether), Schülke &    Mayr, lot 1179743.-   Sodium Hydroxide, Puritan 50% NaOH, UN1824, lot 011043.-   Urea, Sigma Aldrich, lot SLBF4607V.-   Water, Deionized, adjusted to pH 7.

Collagen Gel Digestion

Proteases have been implicated in the treatment of skin disorders. Inorder to determine it α-amylase contained a protease, which is able tocleave a collagen gel (i.e., a protein-based gel), collagen geldigestion was studied by rheology under varied frequency conditionsusing α-amylase and collagenase as potential digesting enzymes. Ifα-amylase had no digestion of the collagen gel, its anti-pruriticactivity would not be based upon any contamination by a protease, andnot by hydrolysis of peptide bonds of collagen polymer chains as bycollagenase.

Collagen gels were prepared at 2.0 mg/mL using collagen type I. Gelswere prepared by mixing 500 μL collagen (˜4.1 mg/mL), 500 μL Dulbecco'sphosphate buffered saline (DPBS without calcium and magnesium), and 10μL 1 N NaOH (diluted from Puritan 50% NaOH). Solid collagen hydrogelsformed after 30 min in a 37° C. incubator. Gels were incubated at 37° C.for 24 hours with the following enzymes:

-   -   2 mg (250 U) collagenase    -   8 mg (250 U) α-amylase #1

Rheological testing was conducted on an Anton Paar MCR 302 rheometerusing a 25 mm parallel plate (for solid gels) and 25 mm cone and plate(for completely liquefied gels, i.e., collagen gel treated withcollagenase). All frequency sweeps were conducted at 37° C. and 1%strain (linear viscoelastic region as determined by a strain amplitudesweep). The data are shown in FIG. 1, for the storage and loss modulivs. frequency, and in FIG. 2, for the complex moduli for untreatedcollagen gel, for amylase treated collagen gel and collagenase treatedcollagen gel.

In FIG. 1, storage (G′) and loss (G″) moduli versus frequency arepresented for untreated collagen gel controls, collagen gels treatedwith 250 U collagenase, and collagen gels treated with 250 U α-amylase#1. The storage modulus represents the solid-like nature and the lossmodulus represents the liquid-like nature of the viscoelastic collagengel. There is no significant difference between storage and loss modulibetween the untreated collagen gel and the gel treated with α-amylase,which demonstrates no collagen (protein) gel digestion by α-amylase. Theprotease collagenase completely liquefied the collagen gel, which isdemonstrated by the significantly lower storage and loss moduli.

In FIG. 2, complex modulus (G*) is plotted versus frequency foruntreated collagen gel controls, collagen gels treated with 250 Ucollagenase, and collagen gels treated with 250 U amylase #1. Complexmodulus accounts for the storage modulus (solid-like behavior) and lossmodulus (liquid-like behavior), which correlates with the gel'sstiffness. α-Amylase #1 does not digest the collagen gels compared tothe untreated collagen gel control (no statistically significantdifference in complex moduli).

These figures demonstrate that collagenase, a protease, completelyliquefied the collagen gels within 24 hours, whereas α-amylase, aprotein enzyme noted for cleavage of α-linked polysaccharides such asstarch and glycogen, did not digest the collagen gel compared to theuntreated collagen gel control (no statistically significant differencein storage moduli, loss moduli, or complex moduli). Moduli are observedto increase with frequency due to the viscoelastic nature of the polymer(collagen) tested. At high frequencies, the collagen polymer chains donot have time to relax, resulting in an observed stiffer viscoelasticbehavior. The data for collagen gel treated with collagenase appearsnoisy due to the liquid-like nature resulting from the digestion of thecollagen gel. Collagenase completely degraded and liquefied the collagengel, and the resulting enzymatically degraded solution had to beevaluated using cone and plate geometry. While the gel was completedliquefied, the resulting solution was still viscoelastic due to thenature of the collagen and peptides remaining in the solution.

The rheology data supports the anti-pruritic activity of α-amylase notbeing dependent on contamination by a protease.

Pruritus Reduction Example 1

A male Caucasian septuagenarian applied bacterial α-amylase #6 solutionto his skin damaged by pruritus, which resulted in inflamed red weltscaused by scratching. The α-amylase solution was adjusted to pH 7 byNaOH, at a ratio of water/amylase of 99.6610.34 by weight, wherein theα-amylase activity was 1 g/25,000 U. The solution was wiped ontoinflamed, pruritic skin containing red welts using a non-woven clothtreated with the enzyme formulation. The solution was left on the skinfor 10 minutes, with no observable discomfort, and removed by wipingseveral times with a wet cloth. The pruritus was reduced approximately15 minutes after initial application, and the skin remained in a lessinflamed state for at least 12 hours. The process was repeated every 12hours for two days with elimination of pruritus and marked reduction andelimination of red welts.

Example 2

On another area of pruritic skin with irritation and inflammation, theabove mentioned male utilized an antimicrobial amylase formulation basedupon 25 mg of porcine pancreatic α-amylase #3 mixed in 21 g ofPHMB-based Antimicrobial Composition (AC), prepared in 4 glass vialscontaining 5.0 ml amylase/AC per vial. Over a period of 48 hours, thecontent of each of the 4 vials were applied on a non-woven fabric every12 hours to cleansed pruritic skin. Itching was abated during the firsttreatment, and irritation and inflammation greatly reduced after 48hours.

Example 3

A 70 year old Caucasian female was bitten by mosquitoes over a two dayperiod. The first area affected was untreated and resulted in a red,itchy bump of approximately one-quarter inch in diameter by day 2. Onthe second day, another mosquito bite occurred, becoming rapidly itchy.The second bite was as pruritic as the first bite and a powder ofbacterial α-amylase #6 was applied directly to both affected areas(i.e., the first and second bites). The first bitten area had adecreased redness and decreased irritation after 15 minutes oftreatment, whereas the second bitten area had decreased redness andelimination of pruritus with no red bump occurring.

Example 4

An Asian female developed a systemic pruritic urticaria. She appliedbacterial α-amylase #6 solution to her skin. The α-amylase solution wasadjusted to pH 7 by NaOH, at a ratio of water/amylase of 99.66/0.34 byweight, wherein the α-amylase activity was 1 g/25,000 U. The solutionwas wiped onto her right arm that was covered with pruritic hives usinga paper towel with the enzyme formulation. The solution was left on theskin for 1 hour, with no observable discomfort, and removed by wipingseveral times with 3 wet paper towels. The pruritus was significantlyreduced approximately 5 minutes after initial application, and lastedfor at least 4 hours.

Amylase Compositions Example 5

In Table 1, amylase formulations were prepared in water based uponα-amylase from animal, human, and bacterial sources, β-amylase frombarley (a grain), and γ-amylase from fungi, and combinations thereof.

TABLE 1 Aqueous formulations of α-amylase, β-amylase, and γ-amylase.formulation ratio formulation formulation (wt %) (Units) H₂O/α-amylase#1 99.2/0.8 1 g/250 U H₂O/α-amylase #2 99.891/0.109 1 g/250 UH₂O/α-amylase #3 99.88/0.12 1 g/250 U H₂O/α-amylase #4 99.8/0.2 1 g/250U H₂O/α-amylase #5 99.95 g/0.05  1 g/250 U H₂O/α-amylase #5 99.9/0.1 1g/500 U H₂O/α-amylase #6 99.9966/0.0033 1 g/250 U H₂O/α-amylase #699.966/0.034  1 g/2,500 U H₂O/α-amylase #6 96.6/3.4    1 g/250,000 UH₂O/α-amylase #7 99.9803/0.0197 1 g/250 U H₂O/α-amylase #7 99.803/0.197 1 g/2,500 U H₂O/α-amylase #7  80.3/19.7    1 g/250,000 U H₂O/β-amylase99.4/0.6 1 g/250 U H₂O/β-amylase 94/6  1 g/2500 U H₂O/γ-amylase 99.8/0.21 g/250 U H₂O/γ-amylase #1 99/1  1 g/1,250 U H₂O/γ-amylase #1 98/2  1g/2,500 U H₂O/γ-amylase #2 99.4/0.6 1 g/250 U H₂O/α-amylase #6/β-amylase96.60/0.34/3.16 1 g/250 U/131 U H₂O/α-amylase #6/β-amylase99.32/0.34/0.34 1 g/250 U/14 U

Example 6

In Table 2, aqueous formulations of α-amylase with lipase are presented.This Example includes a combination of an amylolytic enzyme, α-amylase#3, and a lipolytic enzyme, lipase, wherein both enzymes are fromporcine pancreas.

TABLE 2 Aqueous formulations of formulations of α-amylase #3 with lipaseformulation ratio formulation formulation (wt %) (Units) H₂O/α-amylase#3/lipase 99.8/0.18/0.02 1 g/378 U/72 U  H₂O/α-amylase #3/lipase99.8/0.16/0.04 1 g/336 U/144 U

Example 7

in Table 3 are presented various formulation of α-amylase #1 (fromporcine pancreas) with the aqueous buffer DPBS, with the viscosityincreasing hydrophilic neutral polymer hydroxypropylmethylcellulose(HPMC) and DPBS, with the cationic hydrophilic polymer Polymer-JR(cationic hydroxyethylcellulose) in water, with the keratolytic agenturea in water, with chlorophyllin in water, and with urea andchlorophyllin in water.

TABLE 3 Aqueous formulations of α-amylase formulation ratio formulationformulation (wt %) (Units) DPBS/α-amylase #1 99.2/0.8 1 g/250 UHPMC/DPBS/α-amylase #1 5.0/94.2 g/0.8 0.05 g/0.95 g/250 U PolymerJR-30M/H₂O/ 5.0/94.2 g/0.8 0.05 g/0.95 g/250 U α-amylase #1H₂O/urea/α-amylase #1 89.2/10.0/0.8 1 g/250 U H₂O/cholorophyllin/98.7/0.5/0.8 1 g/250 U α-amylase #1 H₂O/cholorophyllin/ 98.2/1.0/0.8 1g/250 U α-amylase #1 H₂O/urea/cholorophyllin/ 88.7/10.0/0.5/0.8 1 g/250U α-amylase #1

Example 8

In addition to water and buffered solutions (Tables and 3), as well asα-amylase being utilized in powder form, the amylases can be mixed withseveral excipients, including hydrophobic hydrocarbons of petrolatum andmineral oil, hydrophilic —OH containing alcohols of glycerin and PEG400, and the amphiphilic liquid PEG-12 Dimethicone (DC 193), a siliconepolyether. In each case, α-amylase #1 (from porcine pancreas) could bedispersed in these excipients (Table 4). Other excipients could includevarious water-based buffers ranging in pH from 5.0-75, surfactants,silicones, polyether copolymers, polyoxyethylene ethers, vegetable andplant fats and oils, essential oils, hydrophilic and hydrophobicalcohols, vitamins, monoglycerides, laurate esters, myristate esters,palmitate esters, and stearate esters, preferably in liquid, gel, pasteor slurry format,

TABLE 4 Excipients for α-amylase formulation ratio formulationformulation (wt %) (Units) petrolatum/α-amylase #1 99.2/0.8 1 g/250 Umineral oil/α-amylase #1 99.2/0.8 1 g/250 U glycerin/α-amylase #198.2/0.8 1 g/250 U PEG 400/α-amylase #1 98.2/0.8 1 g/250 U DC193/α-amylase #1 98.2/0.8 1 g/250 U

Example 9

Because of the possibility of infection in pruritic tissue withirritation and/or inflammation, the addition of as biological agent thathinders or eradicates microorganisms is desired. Of particular interestare two antimicrobial biguanides used in wound care, poly(hexamethylenebiguanide hydrochloride) (PHMB) and chlorhexidine digluconate (CHG). InTable 5 are compared three formulations of aqueous solutions of PHMBwith α-amylase #6 and CHG with α-amylase #6, all at the same wt % ofα-amylase #6 (from bacteria). For the PHMB-based solutions, theconcentrations studied were at 0.30 wt. % (300 ppm), 0.10 wt % (1,000ppm) and 0.15 wt % (1,500 ppm), while that of CHG was 2.0 wt % (20,000ppm). All solutions were compatible, Whereas PHMB and CHG can beutilized for their biocidal behavior, they can also be used aspreservatives of amylase formulations.

TABLE 5 Antimicrobial formulations of α-amylase formulation ratioformulation formulation (wt %) (Units) H₂O/PHMB/α-amylase #699.51/0.15/0.34 1 g/25,000 U H₂O/PHMB/α-amylase #6 99.56/0.10/0.34 1g/25,000 U H₂O/PHMB/α-amylase #6 99.61/0.05/0.34 1 g/25,000 UH₂O/CHG/α-amylase #6 97.66/2.00/0.34 1 g/25,000 U

Example 10

Reverse microemulsions of α-amylase were also prepared based upon clear,homogeneous solutions of α-amylase in water solubilized by the reverseemulsion surfactant sodium bis(2-ethylhexyl)sulfosuccinate (AOT, AerosolAOT) in the non-stinging, volatile solvent of hexamethyldisiloxane(HMDS) (Table 6). After solvent evaporation, α-amylase can beadministered to pruritic tissue without necessitating wiping or rubbingand alleviating the occurrence of a burning or stinging response oftenassociated with solvents on skin.

The formulations were prepared as follows: α-amylase #6 (from bacteria)was dissolved in water at a concentration of 0.17 wt % (solution A). AOTwas dissolved in WADS at a concentration of 50 wt % (solution B). 40 mg,of solution A was mixed with 100 mg of solution B, and the cloudysolution was shaken until clarity resulted. To this mixture was thenadded 860 mg of HMDS, forming a reverse microemulsion wherein solutionclarity was maintained.

TABLE 6 Reverse microemulsions of α-amylase with AOT in HMDS/waterformulation formulation formulation ratio (wt %) (Units) appearanceHMDS/AOT/H₂O/ 91.0/5.0/4.0/0.0068 1 g/500 clear α-amylase #6HMDS/AOT/H₂O/ 99.1/0.5/0.4/0.00068 1 g/50  clear α-amylase #6

While the above specification contains many specifics, these should notbe construed as limitations on the scope of the invention: but rather asexamples of preferred embodiments thereof. Many other variations arepossible. Accordingly, the scope of the invention should be determinednot bit the embodiments illustrated but by the appended claims and theirlegal equivalents.

1. An enzymatic pruritic composition for topically treating pruritus,comprising a non-proteolytic enzyme component and up to 20 wt-% of aproteolytic enzyme component, wherein said non-proteolytic enzymecomponent comprises at least 80% by weight of amylase, and wherein aweight ratio of non-proteolytic enzymes to proteolytic enzymes in theenzymatic pruritic composition is at least 4:1.
 2. The compositionaccording to claim 1, wherein said amylase is selected from the groupconsisting of amylase isolated from humans, animals, bacteria, plants,fungi, and by genetic recombination of human, animal, bacteria, plant,or fungi amylase.
 3. The composition according to claim 1, wherein saidnon-proteolytic enzyme component comprises at least 10% by weight ofα-amylase.
 4. The composition according to claim 3, wherein saidnon-proteolytic enzyme component comprises β-amylase, γ-amylase, orboth.
 5. The composition according to claim 1, further comprising apharmaceutically acceptable carrier or excipient.
 6. The compositionaccording to claim 1, wherein said non-proteolytic enzyme componentcomprises up to 20% by weight of other hydrolytic enzymes selected fromthe group consisting of chondroitinases, hyaluronidases, lipases,glycosidases, heparanases, dermatanases, pullulanases,N-acetylglucosaminidase, lactases, phospholipases, transglycosylases,esterases, thioester hydrolyases, sulfatases, escharases, nucleases,phosphatases, phosphodiesterases, mannanases, mannosidases, isoamylases,lyases, inulinases, tannases, pentosanases, glucanases, arabinosidases,pectinases, cellulases, chitinases, xylanases, cutinases, pectatelyases, hemicellulases, and combinations thereof.
 7. The compositionaccording to claim 1, wherein the amylase comprises α-amylase obtainedfrom at least one source selected from the group consisting of humanpancreas, animal pancreas, and bacteria.
 8. The composition according toclaim 1, wherein said non-proteolytic enzyme component comprises up to20% by weight of enzymes selected from the group consisting of oxidases,peroxidases, glucose oxidases, catalases, oxidoreductases,phenoloxidases, laccases, lipoxygenases, isomerases, and ligninases. 9.The composition according to claim 1 further comprising at least onepolymeric biguanide in an amount of at least 0.01 weight percent to 1.0weight percent based on a combined weight of amylase and biguanide. 10.The composition according to claim 9, wherein said polymeric biguanidecomprises poly(hexamethylene biguanide) or one of its salts.
 11. Thecomposition according to claim 1 further comprising a water-solublepolymer at a concentration of from 0.01 weight % to 50 weight % of thecomposition, wherein the water-soluble polymer is selected from thegroup consisting of methylcellulose, hydroxyethylcellulose,hydroxypropylcellulose, hydroxypropylmethylcellulose,carboxymethylcellulose, guar gum, hydroxyethylguar, hydroxypropylguar,hydroxypropylmethylguar, carboxymethylguar, carboxymethylchitosan,locust bean gum, carrageenan, xanthan gum, gellan gum, Aloe vera gel,scleroglucan, schizophyllan, gum arabic, tamarind gum, poly(vinylalcohol), poly(ethylene oxide), poly(ethylene glycol), poly(methyl vinylether), Carbomer and its salts, poly(acrylic acid) and its salts,poly(methacrylic acid) and its salts, sodiumpoly(2-acrylamido-2-methylpropanesulfonate), polyacrylamide,poly(N,N-dimethylacrylamide), poly(N-vinylacetamide),poly(N-vinylformamide), poly(2-hydroxyethyl methacrylate), poly(glycerylmethacrylate), poly(N-vinylpyrrolidone), poly(N-isopropylacrylamide) andpoly(N-vinylcaprolactam), and combinations thereof.
 12. The compositionaccording to claim 1 further comprising a chelating agent at aconcentration of from 0.01 weight % to 1 weight % based on a totalweight of the composition, wherein said chelating agent is selected fromthe group consisting of ethylenediaminetetraacetic acid (EDTA),nitrilotriacetic acid, nitrilotripropionic acid,diethylenetriaminepentaacetic acid,2-hydroxyethylethylenediaminetriacetic acid,1,6-diaminohexamethylenetetraacetic acid,1,2-diaminocyclohexanetetraacetic acid,O,O′-bis(2-aminoethyl)ethyleneglycoltetraacetic acid,1,3-diaminopropanetetraacetic acid,N,N′-bis(2-hydroxybenzyl)ethylenediamine-N,N′-diacetic acid,ethylenediamine-N,N′-diacetic acid, ethylenediamine-N,N′-dipropionicacid, triethylenetetraaminehexaacetic acid,ethylenediamine-N,N′-bis(methylenephosphonic acid), iminodiacetic acid,monosodium-N-lauryl-β-iminodipropionic acid (sodiumlauriminodipropionate, Deriphat® 160C), N,N-bis(2-hydroxyethyl)glycine,1,3-diamino-2-hydroxypropanetetraacetic acid,1,2-diaminopropanetetraacetic acid,ethylenediaminetetrakis(methylenephosphonic acid),N-(2-hydroxyethyl)iminodiacetic acid, biphosphonates, editronate, saltsthereof, and combinations thereof.
 13. The composition according toclaim 1 further comprising a monoalkyl glycol selected from the groupconsisting of 1,2-propanediol (propylene glycol), 1,2-butanediol,1,2-pentanediol, 1,2-hexanediol, 1,2-heptanediol, 1,2-octanediol(caprylyl glycol), 1,2-nonanediol, 1,2-decanediol, 1,2-undecanediol,1,2-dodecanediol, 1,2-tridecanediol, 1,2-tetradecanediol,1,2-pentadecanediol, 1,2-hexadecanediol, 1,2-heptadecanediol,1,2-octadecanediol, 2-methyl-2,4-pentanediol, 1,3-butanediol, diethyleneglycol, triethylene glycol, glycol bis(hydroxyethyl)ether, andcombinations thereof.
 14. The composition according to claim 1 furthercomprising a glycerol alkyl ether selected from the group consisting of1-O-heptylglycerol, 1-O-octylglycerol, 1-O-nonylglycerol,1-O-decylglycerol, 1-O-undecylglycerol, 1-O-dodecylglycerol,1-O-tridecylglycerol, 1-O-tetradecylglycerol, 1-O-pentadecylglycerol,1-O-hexadecylglycerol (chimyl alcohol), 1-O-heptadecylglycerol,1-O-octadecylglycerol (batyl alcohol), 1-O-octadec-9-enyl glycerol,selachyl alcohol, glycerol 1-(2-ethylhexyl)ether, octoxyglycerin,2-ethylhexyl glycerin, 3-(2-ethylhexyloxy)propane-1,2-diol, glycerol1-heptyl ether, glycerol 1-octyl ether, glycerol 1-decyl ether, glycerol1-dodecyl ether, glycerol 1-tridecyl ether, glycerol 1-tetradecyl ether,glycerol 1-pentadecyl ether, glycerol 1-hexadecyl ether, glycerol1-octadecyl ether, and combinations thereof.
 15. The compositionaccording to claim 1 further comprising: at least one polymericbiguanide in an amount of at least 0.05 weight %, a chelating agent at aconcentration of 0.01 weight % to 1 weight %, and a vicinal diolcomponent, comprising a vicinal diol selected from the group consistingof a monoalkyl glycol, a monoalkyl glycerol, and a combination thereof,at a concentration of 0.05 weight % to 4 weight %, wherein thepercentages of polymeric biguanide, chelating agent, and vicinal diolare based on a total weight of the composition.
 16. The compositionaccording to claim 1 further comprising at least medicament is selectedfrom the group consisting of an analgesic agent, an anesthetic agent, aneuropathic pain agent, and mixtures thereof.
 17. The compositionaccording to claim 16 wherein the at least one medicament is selectedfrom the group consisting of lidocaine, capsaicin, calamine lotion,benzocaine, tetracaine, prilocaine, bupivacaine, levobupivacaine,procaine, carbocaine, etidocaine, mepivacaine, nortripylene,amitriptyline, pregabalin, diclofenac, fentanyl, gabapentin,ketoconazole, opiods, non-steroidal anti-inflammatory agents,salicylates, and mixtures thereof.
 18. The composition according toclaim 1, wherein the composition is in a form selected from the groupconsisting of a powder, an aqueous solution, an organic liquid solution,a silicone fluid, a gel, a hydrogel, a cream, a film, a latex, anaerosol, a slurry, a paste, a balm, an ointment, and a foam.
 19. Thecomposition according to claim 1, further comprising a dressing whereinsaid non-proteolytic enzyme component is adsorbed on or in a natural orsynthetic fiber, mesh, gauze, cloth, hydrocolloid, alginate, hydrogel,semipermeable film, permeable film, or a natural or synthetic polymer.20. The composition according to claim 1, further comprising a bufferingagent.
 21. The composition according to claim 1, wherein saidnon-proteolytic enzyme component comprises at least 20% by weight ofα-amylase and 20% by weight or less of other non-proteolytic,non-amylase enzymes.
 22. The composition according to claim 1, whereinsaid nono-proteolytic enzyme component is present in an amount of atleast 0.001% by weight based on a total weight of the composition. 23.The composition according to claim 1, comprising a reverse microemulsioncomprising α-amylase solubilized by a hydrophobic reverse emulsionsurfactant in a non-stinging, volatile, hydrophobic solvent, whereinsaid non-stinging, volatile, hydrophobic solvent is selected from thegroup consisting of volatile linear and cyclic siloxanes, volatilealkanes, volatile fluorocarbons and chlorofluorocarbons, liquid carbondioxide under pressure, and combinations thereof.
 24. A method oftreatment of pruritic tissue comprising topically administering atherapeutically effective amount of an enzymatic pruritic composition toitching tissue, wherein said enzymatic pruritic composition comprises anon-proteolytic enzyme component, said non-proteolytic enzyme componentcomprising at least 80% by weight of an amylase, wherein saidnon-proteolytic enzyme component comprises at least 10% by weight ofα-amylase, based on a weight of the non-proteolytic enzyme component andwherein a ratio of non-proteolytic enzymes to proteolytic enzymes in theenzymatic pruritic composition is at least 4:1.
 25. (canceled)
 26. Themethod according to claim 24 of preparing an anti-pruritic compositioncomprising α-amylase with a pharmaceutically acceptable carrier oremollient.
 27. A kit, comprising: an enzymatic pruritic compositioncomprising a non-proteolytic enzyme component, wherein saidnon-proteolytic enzyme component comprises at least 80% by weight ofamylase, and wherein a ratio of non-proteolytic enzymes to proteolyticenzymes in the enzymatic pruritic composition is at least 4:1; andinstructions for topically applying said enzymatic pruritic compositionto itchy tissue.
 28. The composition according to claim 1, wherein saidproteolytic enzyme component is present in an amount of less than 0.01%by weight based on a total weight of the composition.